Added possibility to give feedbacks via ajax form. Closes #2

* Feedback message will send to error_recipients, configured in app_config.yml

test/functional/feedback_controller_test.rb

@@ -0,0 +1,8 @@
+require 'test_helper'
+
+class FeebackControllerTest < ActionController::TestCase
+  # Replace this with your real tests.
+  test "the truth" do
+    assert true
+  end
+end